upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
74 lines
2.8 KiB
74 lines
2.8 KiB
23 years ago
|
/*
|
||
|
|
* (C) Copyright 2001
|
||
|
|
* Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
|
||
|
|
*
|
||
|
|
* See file CREDITS for list of people who contributed to this
|
||
|
|
* project.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU General Public License as
|
||
|
|
* published by the Free Software Foundation; either version 2 of
|
||
|
|
* the License, or (at your option) any later version.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
||
|
|
* MA 02111-1307 USA
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef _SPI_H_
|
||
|
|
#define _SPI_H_
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The function call pointer type used to drive the chip select.
|
||
|
|
*/
|
||
|
|
typedef void (*spi_chipsel_type)(int cs);
|
||
|
|
|
||
|
|
|
||
|
|
/*-----------------------------------------------------------------------
|
||
|
|
* Initialization, must be called once on start up.
|
||
|
|
*/
|
||
|
|
void spi_init(void);
|
||
|
|
|
||
|
|
|
||
|
|
/*-----------------------------------------------------------------------
|
||
|
|
* SPI transfer
|
||
|
|
*
|
||
|
|
* This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks
|
||
|
|
* "bitlen" bits in the SPI MISO port. That's just the way SPI works.
|
||
|
|
*
|
||
|
|
* The source of the outgoing bits is the "dout" parameter and the
|
||
|
|
* destination of the input bits is the "din" parameter. Note that "dout"
|
||
|
|
* and "din" can point to the same memory location, in which case the
|
||
|
|
* input data overwrites the output data (since both are buffered by
|
||
|
|
* temporary variables, this is OK).
|
||
|
|
*
|
||
|
|
* If the chipsel() function is not NULL, it is called with a parameter
|
||
|
|
* of '1' (chip select active) at the start of the transfer and again with
|
||
|
|
* a parameter of '0' at the end of the transfer.
|
||
|
|
*
|
||
|
|
* If the chipsel() function _is_ NULL, it the responsibility of the
|
||
|
|
* caller to make the appropriate chip select active before calling
|
||
|
|
* spi_xfer() and making it inactive after spi_xfer() returns.
|
||
|
|
*
|
||
|
|
* spi_xfer() interface:
|
||
|
|
* chipsel: Routine to call to set/clear the chip select:
|
||
|
|
* if chipsel is NULL, it is not used.
|
||
|
|
* if(cs), make the chip select active (typically '0').
|
||
|
|
* if(!cs), make the chip select inactive (typically '1').
|
||
|
|
* dout: Pointer to a string of bits to send out. The bits are
|
||
|
|
* held in a byte array and are sent MSB first.
|
||
|
|
* din: Pointer to a string of bits that will be filled in.
|
||
|
|
* bitlen: How many bits to write and read.
|
||
|
|
*
|
||
|
|
* Returns: 0 on success, not 0 on failure
|
||
|
|
*/
|
||
|
|
int spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar *dout, uchar *din);
|
||
|
|
|
||
|
|
#endif /* _SPI_H_ */
|